Light-emitting device, display apparatus and lighting apparatus

ABSTRACT

Provided is a light-emitting device with reduced in-plane luminance variation. The light-emitting device includes a main substrate, a plurality of light sources, a plurality of lenses, and one or more light reflection members. The main substrate includes a central part and a peripheral part that surrounds the central part. The plurality of light sources are each disposed on the central part of the main substrate. The plurality of lenses are disposed to correspond to the plurality of light sources respectively. The plurality of lenses apply optical effects to beams of light from the plurality of light sources respectively. One or more light reflection members are each disposed on the peripheral part. The light reflection members each have reflectance that is higher than the reflectance of the main substrate.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 17/560,952, filed Dec. 23, 2021 which is a continuation of U.S.patent application Ser. No. 15/750,537, filed Feb. 6, 2018, whichapplication is a national phase entry under 35 U.S.C. § 371 ofInternational Application No. PCT/JP2016/069928, filed Jul. 5, 2016,which claims priority from Japanese Patent Application No. 2015-167267,filed Aug. 26, 2015, all of which are incorporated herein by reference.

TECHNICAL FIELD

The disclosure relates to a light-emitting device, and to a displayapparatus and a lighting apparatus that include such a light-emittingdevice.

BACKGROUND ART

A light-emitting device that uses an LED (Light Emitting Diode) as alight source is adopted in a backlight of a liquid crystal displayapparatus, a lighting apparatus, and so forth. For example, PTL 1discloses a so-called direct-type backlight provided with a plurality ofthe LEDs disposed on a substrate and with wide-angle lenses disposedabove the respective LEDs.

CITATION LIST Patent Literature

-   PTL 1: Japanese Unexamined Patent Application Publication No.    2014-13744

SUMMARY OF THE INVENTION

Incidentally, nowadays, a reduction in the number of light sources isfurther promoted from the viewpoints of thinning of the displayapparatus and the lighting apparatus and of a reduction in the number ofcomponents. However, in an existing structure, when further thinning andthe reduction in the number of the light sources are made in the future,there is a possibility that light from the light source may not besufficiently diffused through a lens, causing an in-plane luminanceunevenness to occur.

It is therefore desirable to provide a light-emitting device withreduced in-plane luminance variation, and a display apparatus and alighting apparatus that include such a light-emitting device.

A first light-emitting device according to an embodiment of thedisclosure includes a main substrate, a plurality of light sources, aplurality of lenses, and one or more light reflection members. The mainsubstrate includes a central part and a peripheral part that surroundsthe central part. The plurality of light sources are each disposed onthe central part of the main substrate. The plurality of lenses aredisposed to correspond to the plurality of light sources respectively.The plurality of lenses apply optical effects to beams of light from theplurality of light sources respectively. One or more light reflectionmembers are each disposed on the peripheral part. The light reflectionmembers each have reflectance that is higher than the reflectance of themain substrate. In addition, a first display apparatus and a firstlighting apparatus according to respective embodiments of the disclosureeach include the above-described first light-emitting device.

In the first light-emitting device according to an embodiment of thedisclosure, one or more light reflection members that each have thereflectance that is higher than the reflectance of the main substrateare provided on the peripheral part of the main substrate, thusalleviating an in-plane luminance deviation even in a case where thenumber of the light sources is reduced.

A second light-emitting device according to an embodiment of thedisclosure includes a main substrate, a plurality of light sources, afirst lens, and a second lens. The plurality of light sources are eachprovided on the main substrate. The first lens is provided to correspondto a first light source of the plurality of light sources. The firstlens has a first shape. The second lens is provided to correspond to asecond light source of the plurality of light sources. The second lenshas a second shape that is different from the first shape. In addition,a second display apparatus and a second lighting apparatus according torespective embodiments of the disclosure each include theabove-described second light-emitting device.

In the second light-emitting device according to an embodiment of thedisclosure, the first lens and the second lens that are different fromeach other in shape are provided to correspond to the respective lightsources, thus alleviating the in-plane luminance deviation even in thecase where the number of the light sources is reduced.

According to the light-emitting device of an embodiment of thedisclosure, it is possible to emit light having higher uniformity in anemission surface while mounted with a smaller number of the lightsources. That is, it is possible to efficiently emit light with reducedluminance unevenness and reduced color deviation in the emissionsurface. Therefore, according to a display apparatus using thislight-emitting device, it is possible to exhibit excellent displayperformance. In addition, according to a lighting apparatus using thislight-emitting device, it is possible to perform more homogeneousillumination on an object. It is to be noted that the effects of thedisclosure are not limited to those described above, and may be any ofeffects that are described in the following.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an overall configuration example of alight-emitting device according to a first embodiment of the disclosure.

FIG. 2 is a cross-sectional view of a configuration example of a mainpart of the light-emitting device illustrated in FIG. 1 .

FIG. 3 is a plan view of the overall configuration example of thelight-emitting device illustrated in FIG. 1 .

FIG. 4 is an enlarged cross-sectional view of a configuration example ofa peripheral part of a main substrate and a portion of a reflectionmember illustrated in FIG. 3 .

FIG. 5A is an enlarged plan view of a main part of a light-emittingdevice according to a first modification example (Modification Example1-1) of the first embodiment.

FIG. 5B is a cross-sectional view of a portion of the light-emittingdevice illustrated in FIG. 5A.

FIG. 5C is a cross-sectional view of workings of the light-emittingdevice illustrated in FIG. 1 .

FIG. 6 is an enlarged cross-sectional view of a main part of alight-emitting device according to a second modification example of thefirst embodiment (Modification Example 1-2).

FIG. 7 is a plan view of an overall configuration example of alight-emitting device according to a third modification example of thefirst embodiment (Modification Example 1-3).

FIG. 8 is a. plan view of an overall configuration example of alight-emitting device according to a fourth modification example of thefirst embodiment (Modification Example 1-4).

FIG. 9 is a plan view of an overall configuration example of alight-emitting device according to a fifth modification example of thefirst embodiment (Modification Example 1-5).

FIG. 10 is a perspective view of an overall configuration example of alight-emitting device according to a second embodiment of thedisclosure.

FIG. 11 is a cross-sectional view of a configuration example of a mainpart of the light-emitting device illustrated in FIG. 10 .

FIG. 12 is a plan view of an overall configuration example of alight-emitting device according to a first modification example of thesecond embodiment (Modification Example 2-1).

FIG. 13 is a plan view of an overall configuration example of alight-emitting device according to a second modification example of thesecond embodiment (Modification Example 2-2).

FIG. 14 is a cross-sectional view of a portion of the light-emittingdevice illustrated in FIG. 13A.

FIG. 15 is a plan view of an overall configuration example of alight-emitting device according to a third modification example of thesecond embodiment (Modification Example 2-3).

FIG. 16 is a perspective view of an external appearance of a displayapparatus according to a third embodiment of the disclosure.

FIG. 17 is an exploded perspective view of a main body illustrated inFIG. 16 .

FIG. 18 is an exploded perspective view of a panel module illustrated inFIG. 17 .

FIG. 19A is a perspective view of an external appearance of tabletterminal apparatus (Application Example 1) mounted with the displayapparatus according to the disclosure.

FIG. 19B is a perspective view of an external appearance of anothertablet terminal apparatus (Application Example 2) mounted with thedisplay apparatus according to the disclosure.

FIG. 20 is a perspective view of an external appearance of a firstlighting apparatus (Application Example 3) provided with thelight-emitting device according to the disclosure.

FIG. 21 is a perspective view of an external appearance of a secondlighting apparatus (Application Example 4) provided with thelight-emitting device according to the disclosure.

FIG. 22 is a perspective view of an external appearance of a thirdlighting apparatus (Application Example 5) provided with thelight-emitting device according to the disclosure.

FIG. 23 is a plan view of a light-emitting device in ExperimentalExample 1-1.

FIG. 24 is a plan view of a light-emitting device in ExperimentalExample 2-1.

FIG. 25 is a characteristic diagram illustrating a luminancedistribution across a light emission region in Experimental Example 2-1.

FIG. 26 is a characteristic diagram illustrating the luminancedistribution across the light emission region in Experimental Example2-2.

FIG. 27 is a characteristic diagram illustrating the luminancedistribution across the light emission region in Experimental Example2-3.

FIG. 28 is a plan view of an overall configuration example of anothermodification of the light-emitting device according to the disclosure.

MODES FOR CARRYING OUT THE INVENTION

In the following, embodiments of the disclosure are described in detailwith reference to the drawings. It is to be noted that description isgiven in the following order.

1. First Embodiment

A light-emitting device in which a high-reflection member is disposed ona peripheral part of a main substrate

2. Modification Examples of First Embodiment

3. Second Embodiment

A light-emitting device using two or more lenses

4. Modification Examples of Second Embodiment

5. Third Embodiment (Display Apparatus; Liquid Crystal DisplayApparatus)

6. Application Examples of Display Apparatus

7. Application Examples of Lighting apparatus

8. Experimental Examples

1. First Embodiment

[Configuration of Light-Emitting Device 1]

FIG. 1 is a perspective view of an overall configuration of alight-emitting device 1 according to a first embodiment of thedisclosure. FIG. 2 is an enlarged cross-sectional view of a main part ofthe light-emitting device 1. FIG. 3 is a plan view of an internalconfiguration of the light-emitting device 1. The light-emitting device1 is used, for example, as a backlight that illuminates a transmissiveliquid crystal panel from behind or as a lighting apparatus in a room,and so forth. It is to be noted that FIG. 3 illustrates a state where anoptical sheet 30 described later is removed to allow for visualconfirmation of the inside of the light-emitting device 1. In addition,FIG. 2 corresponds to a cross-section in an arrow direction along a lineII-II illustrated in FIG. 3 . In addition, FIG. 4 is a cross-sectionalview of a cross-section in an arrow direction along a line IV-IVillustrated in FIG. 3 .

The light-emitting device 1 has, for example, a plurality of lightsources 10 (omitted in FIG. 1 ; refer to FIG. 2 and FIG. 3 ), a lens 20,an optical sheet 30, a back chassis 40, a light reflection member 50, alight source substrate 60, and a reflection sheet 70 (omitted in FIG. 1and FIG. 3 ; refer to FIG. 2 and FIG. 4 ).

In the specification, it is assumed that a direction of a distanceconnecting the light source 10 to the optical sheet 30 is a Z direction(a front-back direction), a left-right direction on principal planes ofthe back chassis 40 and the optical sheet 30 (a widest plane in each ofthe principal planes) is an X-direction, and a top-bottom direction is aY-direction. The light-emitting device 1 has, for example, a rectangularplanar shape on an XY plane, and a portion or the whole of the principalplane of the optical sheet 30 having the rectangular planar shapefunctions as an emission surface. Accordingly, the light-emitting device1 has a rectangular light emission region.

(Back Chassis 40)

The back chassis 40 is a substantially plate-shaped member thatincludes, for example, a flat central part 41 and peripheral parts 42(42A to 42D). The peripheral parts 42 are disposed to surround thecentral part 41 and are inclined relative to the central part 41. Theback chassis 40 is covered with the reflection sheet 70 and configures amain substrate. The central part 41 has a rectangular planar shape inwhich, for example, the X-direction is set as a longitudinal direction.An outer edge of the peripheral part 42 also assumes a rectangular shapein planar view (refer to FIG. 3 ). The peripheral part 42A and theperipheral part 42B face each other with the central part 41 beinginterposed therebetween in the Y-direction, and each extend in theX-direction along a long side of the central part 41. The peripheralpart 42C and the peripheral part 42D face each other with the centralpart 41 being interposed therebetween in the X-direction, and eachextend in the Y-direction along a short side of the central part 41. Aninner surface 42S of the peripheral part 42 is inclined to form an angleθ (for example, 15 degrees) relative to an inner surface 41S of thecentral part 41.

Examples of constituent materials of the back chassis 40 include resinmaterials as follows, in addition to metal materials such as SECC (iron)and aluminum. Examples of the resin materials to be used in the backchassis 40 include acrylic resins such as a polycarbonate resin and PMMA(polymethylmethacrylate resin), polyester resins such as polyethyleneterephthalate, amorphous copolymer polyester resins such as MS (acopolymer of methyl methacrylate and styrene), polystyrene resins, andpolyvinyl chloride resins.

(Light Source 10)

The plurality of light sources 10 are provided and are arranged, forexample, in matrix on the central part 41 of the back chassis 40. Eachlight source 10 is, for example, a point light source that has anoptical axis CL in a direction (Z direction) that is orthogonal to theinner surface 41S of the central part 41, and is specifically configuredby an LED (Light Emitting Diode) that oscillates white light. Theplurality of light sources 10 are disposed to be arranged side by sidein the X-direction on one light source substrate 60 to form one lightsource unit 10U. The light source substrate 60 extends, for example, inthe X-direction on the central part 41 of the back chassis 40. FIG. 1and FIG. 3 each illustrate an example in which three light source units10U are installed to be arranged side by side in the Y-direction on thecentral part 41 of the back chassis 40. However, in the technology, thenumber of the light source units 10U is not limited thereto, and eithermay be two or less or may be four or more. The light source substrate 60is provided with a plurality of drive circuits 61 (refer to FIG. 2 ) atcorresponding positions of the plurality of light sources 10 that areeach disposed on the substrate 60. The drive circuits 61 drive, forexample, the light sources 10. The light source substrates 60 of therespective light source units 10U are each fixed to the inner surface41S of the central part 41 of the back chassis 40. In addition, asillustrated in FIG. 3 , in a certain light source unit 10U, for example,a distance D1 between the light source 10A and the light source 10B thatare mutually adjacent at a position near a middle position of thecentral part 41 in the X-direction may be made larger than a distance D2between the light source 10A and the light source 10C that are mutuallyadjacent at a position near both ends of the central part 41 in theX-direction. This is because much light reaches the vicinity of themiddle of the central part 41 than the vicinity of an outer edge of thecentral part 41 from the light sources 10, thus leading to a possibilityof an increased difference between a luminance in the vicinity of themiddle of the central part 41 and a luminance in the vicinity of theouter edge of the central part 41 (uniformity of the luminance may bereduced), for example, when the distance D1 is made equal to thedistance D2. That is, the luminance distribution of emitted lightobtained from the light-emitting device 1 may be further flattened byallowing an arrangement density of the light sources 10 in the vicinityof the outer edge of the central part 41 to be higher than that in thevicinity of the middle of the central part 41.

(Lens 20)

The lens 20 is disposed on each of the optical axes CL above therespective light sources 10. The lens 20 is, for example, a reflectivelens, and has optical effects. The optical effects include reflectinglight L1 incident from the light source 10 at a lens surface 20S that islocated on side opposite to the light source 10, and diffusing the lightto the surroundings. The lens 20 may be present at a position where thelens 20 overlaps the inner surface 42S of the peripheral part 42 in adirection that is parallel to the inner surface 41S. That is, a distanceH20 from an upper end 20T of the lens 20 to the inner surface 41S issmaller than a distance H30 between a lower surface 30S of the opticalsheet 30 and the inner surface 41S.

(Reflection Sheet 70)

The reflection sheet 70 is provided to cover, for example, the backchassis 40 and the light source substrate 60 that is provided on theback chassis 40. The reflection sheet 70 has a function of applyingoptical effects such as reflection, diffusion, and scattering (in thefollowing, referred to as the reflection, and so forth), for example, tothe incident light. The reflection sheet 70 is configured by, forexample, foamed PET (polyethylene terephthalate), and so forth.

(Light Reflection Member 50)

As illustrated in FIG. 4 , the light reflection member 50 is asheet-shaped or a film-shaped member that is provided, for example, onthe peripheral part 42, with the reflection sheet 70 being interposedtherebetween; a surface 50S thereof (refer to FIG. 4 ) has a function ofregular reflection (specular reflection). Specifically, it is preferablethat the reflection member 50 may have a surface having a reflectancethat is higher than that of the reflection sheet 70 that covers the backchassis 40. The back chassis 40 is subjected to a treatment such assilver vapor deposition, aluminum vapor deposition, and multilayer filmreflection. The light reflection members 50 may be provided at positionscorresponding to, for example, four corners of the rectangular emissionsurface of the light-emitting device 1 on the peripheral part 42 of theback chassis 40. More specifically, the light-emitting device 1 includesa light reflection member 50A, a light reflection member 50B, a lightreflection member 50C, and a light reflection member 50D as illustratedin FIG. 3 . The light reflection member 50A is provided in the vicinityof a boundary between the peripheral part 42A and the peripheral part42C. The light reflection member 50B is provided in the vicinity of aboundary between the peripheral part 42C and the peripheral part 42B.The light reflection member 50C is provided in the vicinity of aboundary between the peripheral part 42B and the peripheral part 42D.The light reflection member 50D is provided in the vicinity of aboundary between the peripheral part 42D and the peripheral part 42A.

(Optical Sheet 30)

The optical sheet 30 is provided to face the inner surface 41S and theinner surface 42S of the back chassis 40, and includes, for example, adiffusion plate 31, a diffusion sheet 32, and a lens film 33. Theoptical sheet 30 may further include a polarized light reflection sheet,and so forth. The optical sheet 30 is supported by the outer edge of theperipheral part 42. Owing to provision of such an optical sheet 30, itbecomes possible to diffuse the light that is outputted from the lightsource 10 via the lens 20 and to raise the light further in a frontdirection, thus making it possible to increase the uniformity of theluminance and a front luminance. In addition, in the light-emittingdevice 1, a wavelength conversion sheet may be provided between theoptical sheet 30 and the lens 20.

[Workings and Effects of Light-Emitting Device 1]

The light source 1 is the point light source, and thus the light fromthe light source 1 travels from a light emission point of the lightsource 1 toward the lens 2 while spreading in all directions. The lightis reflected at the reflection surface 20S of the lens 2, then issubjected to the optical effects such as the reflection, and so forth atthe inner surface 41S of the central part 41 and the inner surface 42Sof the peripheral part 42, and further travels toward the optical sheet30. In addition, a portion of the light reflected at the reflectionsurface 20S of the lens 2 is reflected at the surface 50S of the lightreflection member 50 that is provided on the peripheral part 42, andthen travels toward the optical sheet 30. The light traveling toward theoptical sheet 30 finally passes through the optical sheet 30, and isobserved as emitted light on the outside of the optical sheet 30 (onside opposite to the light source 1). Here, in the light-emitting device1 according to the embodiment, the light reflection member 50 having ahigher reflectance is provided on the peripheral part 42 of the backchassis 40. This allows reduction in emission luminance on the fourcorners of the rectangular emission surface (XY plane) to be compensatedfor by reflection of light from the light reflection member 50, thusalleviating a luminance deviation across the rectangular emissionsurface. Accordingly, in the light-emitting device 1, it is possible toreduce the number of the light sources 10 to be mounted on thelight-emitting device 1 while promoting homogeneity of the luminancedistribution on the rectangular emission surface.

According to the light-emitting device 1, it is possible to emit thelight having higher uniformity in the emission surface in this way. Thatis, it is possible to efficiently emit the light having less luminanceunevenness and less color deviation in the emission surface.Consequently, it is possible to exhibit an excellent display performanceby using the light-emitting device 1 in a display apparatus. Inaddition, it is possible to perform more homogeneous illumination on theobject by using the light-emitting device 1 in a lighting apparatus.

2. Modification Examples of First Embodiment 2-1. Modification 1-1

(Configuration of Light-Emitting Device 1A)

Next, the light-emitting device 1A according to a first modificationexample of the above-described first embodiment is described withreference to FIG. 5A and FIG. 5B. FIG. 5A is an enlarged plan view of amain part of the light-emitting device 1A, and FIG. 5B is a partialcross-sectional view along line VB-VB illustrated in FIG. 5A.

In the light-emitting device 1A according to the modification example,an end 50L of the light reflection member 50 is covered with an end 73Lof the reflection sheet 70 that covers the inner surface 42S of theperipheral part 42 of the back chassis 40. The light-emitting device 1Ahas a configuration that is substantially similar to that of thelight-emitting device 1 according to the first embodiment, except forthis point. Specifically, the light reflection members 50 are disposedat positions corresponding to the four corners of the emission surfaceof the light-emitting device 1A on the peripheral part 42, and the end70L of the reflection sheet 70 is provided to cover the end 50L of thelight reflection member 50.

(Workings and Effects of Light-Emitting Device 1A)

In the light-emitting device 1A, the end 50L of the light reflectionmember 50 is covered with the end 70L of the reflection sheet 70, thusmaking it possible to prevent light L emitted from the light source 10from entering an end face 50T of the light reflection member 50.However, the light-emitting device 1 according to the above-describedfirst embodiment is provided with the light reflection member 50 on thereflection sheet 70. Therefore, the end face 50T of the light reflectionmember 50 is in an exposed state, for example, as illustrated in FIG.5C. Accordingly, a portion of the light L emitted from the light source10 enters the end face 50T of the light reflection member 50. Thus,there are cases where a dark line is visually confirmed at a positioncorresponding to the end face 50T, on the emission surface of the lightemitting deice 1. In contrast, in the present modification example, theend face 50T is not irradiated with the light L. Therefore, it ispossible to prevent generation of the dark line on the emission surface,thus allowing for further improvement in flatness of the luminancedistribution emitted from the emission surface.

2-2. Modification Example 1-2

FIG. 6 is an enlarged cross-sectional view of a main part of alight-emitting device 1B according to a second modification example ofthe above-described first embodiment. In the light-emitting device 1B,the reflection sheet 70 is provided to cover the inner surface 42S ofthe peripheral part 42, and an end face of the reflection sheet 70 isbrought into abutment on the end face of the light reflection member 50.The light-emitting device 1B has a configuration that is substantiallysimilar to that of the light-emitting device 1 according to theabove-described first embodiment, except for this point. Also in thelight-emitting device 1B according to the present modification example,it is possible to prevent generation of the dark line on the emissionsurface, thus allowing for further improvement in the flatness of theluminance distribution emitted from the emission surface.

2-3. Modification Examples 1-3 to 1-5

FIG. 7 to FIG. 9 are plan views, respectively, of light-emitting devices1C to 1E according to corresponding third to fifth modification examplesof the above-described first embodiment. Although, the light-emittingdevice 1 according to the first embodiment is provided with the lightreflection members 50 on the four corners of the light emission region,the disclosure is not limited thereto.

For example, as in the light-emitting device 1C according to the thirdmodification example illustrated in FIG. 7 , the light reflection member50 may be provided on a portion or the entire of a region (a shadedregion in FIG. 7 ) that surrounds the light sources 10 disposed on thecentral part 41. In this case, for example, when a maximum value ofintervals between the light sources that are mutually adjacent in theX-direction and the Y-direction is P, the light reflection member 50 maybe provided in a region (a peripheral region) that is apart from all thelight sources 10 by P/2 or more. When an intensity of light that reachesa position that is apart from one light source 10 by P/2 from that onelight source 10 is set as PW, light of an intensity that is not lessthan PW will reach a region (a central region) other than the peripheralregion from one or more light sources 10. However, in a case where thelight reflection member 50 is not disposed, the intensity of light thatreaches the peripheral region becomes less than PW. In thelight-emitting device 1C, it is possible to compensate for the intensityof the light that reaches the peripheral region by disposing the lightreflection member 50 as illustrated in FIG. 7 . Consequently, in thelight-emitting device 1C, it is possible to further improve the flatnessof the luminance distribution emitted from the emission surface.

In addition, as in the light-emitting device 1D according to the fourthmodification example illustrated in FIG. 8 , the occupation area of theupper peripheral part 42A may be made larger than the occupation area ofeach of other peripheral parts 42B to 42D, thus providing the lightreflection member 50 only on the peripheral part 42A.

Alternatively, as in the light-emitting device 1E according to the fifthmodification example illustrated in FIG. 9 , the occupation areas of theleft and right peripheral parts 42C and 42D may be made larger than theoccupation areas of the upper and lower peripheral parts 42A and 42B,thus providing the light reflection members 50 only on the peripheralparts 42C and 42D.

3. Second Embodiment

[Configuration of Light-Emitting Device 2]

FIG. 10 is a plan view of an overall configuration of the light-emittingdevice 2 according to a second embodiment of the disclosure. Inaddition, FIG. 11 is an enlarged cross-sectional view of a main part ofthe light-emitting device 2, and corresponds to a cross-section in anarrow direction along a line XI-XI illustrated in FIG. 10 . Thelight-emitting device 2 has a configuration that is substantiallysimilar to that of the light-emitting device 1 according to theabove-described first embodiment, except for a point that two lenses 71and 72 of mutually different shapes are used in place of provision ofthe light reflection members 50. Accordingly, in the followingdescription, the same reference numerals are used for constitutionalelements that are substantially the same as those of the light-emittingdevice 1 in the light-emitting device 2, and description thereof isomitted where appropriate.

Specifically, in the light emitting deice 2, the lenses 71 are disposedto correspond to respective light sources 10AR, of the plurality oflight sources 10, located on the four corners of the central part 41.The lenses 72 are disposed to correspond to respective light sources10CR other than the light sources 10AR of the plurality of light sources10. Both of the lens 71 and the lens 72 apply the optical effects to thelight incident from the light sources 10. However, spreading of lightL71, on the XY plane, that enters the lens 71, is reflected at a surface71S, and then is outputted from the lens 71 is larger than spreading oflight L72, on the XY plane, that enters the lens 72 and then isoutputted from a surface 72S of the lens 72. That is, the lens 71 isable to diffuse the light from the light source 10 in a wider range thanthe lens 72. The lens 71 is a reflective lens that diffuses the lightfrom, for example, the light source 10AR along the inner surface 41S ofthe central part 41 and outputs the light L71. The lens 72 is arefractive lens that refracts the light from, for example, the lightsource 10CR to travel toward side opposite to the central part 41(toward the optical sheet 30) to output the light L72.

[Workings and Effects of Light-Emitting Device 2]

In the light-emitting device 2, the lenses 71 and 72 having the mutuallydifferent shapes are appropriately selected and disposed in accordancewith the positions of the light sources 10 that face the lenses in thisway. Therefore, it is possible to promote optimization of the luminancedistribution in the light emission region by utilizing the spreading ofthe light L71 and the light L72 that are outputted via the lenses 71 and72, respectively. Specifically, in the light-emitting device 2, it ispossible to alleviate the reduction in luminance in the peripheralregion relative to the luminance in the central region of the lightemission region by disposing the reflective lenses 71 on the fourcorners of the light emission region. Thereby, the luminance deviationacross the rectangular emission surface is alleviated. Accordingly, alsoin the light-emitting device 2, it is possible to reduce the number ofthe light sources 10 to be mounted on the light-emitting device 2 whilepromoting the homogenization of the luminance distribution on therectangular emission surface, similarly to the light-emitting device 1.Further, owing to installation of the refractive lenses 72 in additionto the reflective lenses 71, it is possible to improve the luminance ofthe light emitted from the overall light mission surface of thelight-emitting device 2, thus making it possible to increase luminousefficiency, in comparison with a case where the lenses are configuredonly by the reflective lenses.

4. Modification Examples of Second Embodiment 4-1. Modification Example2-1

Next, a light-emitting device 2A according to a first modificationexample of the above-described second embodiment is described withreference to FIG. 12 . FIG. 12 is a plan view of an overallconfiguration of the light-emitting device 2A. In the light-emittingdevice 2A according to the present modification example, the pluralityof lenses 71 are provided to surround the plurality of lenses 72 thatare provided in a region surrounded by a broken line. In thelight-emitting device 2A, it is possible to further alleviate thelowering of luminance in the peripheral region relative to the luminanceof the central region of the light emission region.

4-2. Modification Example 2-2

Next, a light-emitting device 2B according to a second modificationexample of the above-described second embodiment is described withreference to FIG. 13 . FIG. 13 is a plan view of an overallconfiguration of the light-emitting device 2B. In addition, FIG. 14 isan enlarged cross-sectional view of a main part of the light-emittingdevice 2B, and corresponds to a cross-section in an arrow directionalong a line XIV-XIV illustrated in FIG. 13 . The light-emitting device2B according to the present modification example further has a lens 73having a shape that is different from any of the shape of the lens 71and the shape of the lens 72. Specifically, the light-emitting device 2Bhas the four lenses 71 that are disposed on the respective four cornersof the central part 41, the plurality of lenses 73 that are eachdisposed at a position interposed between the two adjacent lenses 71,and the plurality of lenses 72 that are each surrounded by the lenses 71and the lenses 73. Here, the lens 73 diffuses the light from the lightsource 10 in a wider range than the lens 72. However, light L73 that isoutputted from a surface 73S of the lens 73 remains in a range that isnarrower than that of the light L71 that is reflected from the surface71S of the lens 71 and then is outputted.

4-3. Modification Example 2-3

FIG. 15 is a plan view of an overall configuration of a light-emittingdevice 2C according to a third modification of the above-describedsecond embodiment. The light-emitting device 2C has a configuration thatis similar to that of the light-emitting device 2 according to theabove-described second embodiment, except for arrangement of the lightreflection members 50 on the four corners. According to thelight-emitting device 2C, it is possible to further increase theluminance in regions of the four corners, on the emission surface, whichare each least likely to receive the light from the light source 10.

5. Third Embodiment

FIG. 16 illustrates an external appearance of a display apparatus 101according to a third embodiment of the technology. The display apparatus101 is used as a thin television provided with, for example, thelight-emitting device 1, and has a configuration in which a plate-shapedmain body 102 for image display is supported by a stand 103. It is to benoted that the display apparatus 101 may be provided with any of thelight-emitting devices 1A to 1C, 2, and 2A to 2C in place of thelight-emitting device 1. In addition, the display apparatus 101 isinstalled on a horizontal plane such as a floor, a rack, and a stand,and is used as the stationary-type one, with the stand 103 beingattached to the main body 102. However, it is also possible to use thedisplay apparatus 101 as the wall-mounted type one, with the stand 103being detached from the main body 102.

FIG. 17 illustrates the main body 102 illustrated in FIG. 16 in anexploded state. The main body 102 includes, for example, from front side(viewer side), a front exterior member (a bezel) 111, a panel module112, and a rear exterior member (a rear cover) 113 in this order. Thefront exterior member 111 is a frame-shaped member that covers a frontperipheral part of the panel module 112, and a pair of speakers 114 isdisposed at the lower part thereof. The panel module 112 is fixed to thefront exterior member 111, and a power source substrate 115 and a signalsubstrate 116 are mounted on a rear surface of the panel module 112,with a metal fitting 117 being fixed to the rear surface. The metalfitting 117 is used for fitting of a wall-mounted bracket, fitting ofthe substrate and so forth, and fitting of the stand 103. The rearexterior member 113 covers the rear surface and side faces of the panelmodule 112.

FIG. 18 illustrates the panel module 112 illustrated in FIG. 17 in theexploded state. The panel module 112 includes, from front side (viewerside), a front housing (a top chassis) 121, a liquid crystal panel 122,a frame-shaped member (a middle chassis) 80, the optical sheet 30, thelight source unit 10U and the lens 20, the back chassis 40 and the lightreflection member 50, a rear housing (a back chassis) 124, and a timingcontroller substrate 127 in this order, for example.

The front housing 121 is a frame-shaped metal component that covers thefront peripheral part of the liquid crystal panel 122. The liquidcrystal panel 122 includes, for example, a liquid crystal cell 122A, asource substrate 122B, and a flexible substrate 122C such as a chip onfilm (COF) that couples these component parts. The frame-shaped member80 is a frame-shaped resin-made component that holds the liquid crystalpanel 122 and an optical sheet 50. The rear housing 124 is a metalcomponent made of iron (Fe) and so forth and accommodates the liquidcrystal panel 122 and the light-emitting device 10. The timingcontroller substrate 127 is also mounted on a rear surface of the rearhousing 124.

In the display apparatus 101, image display is performed by causing theliquid crystal panel 122 to selectively transmitting the light from thelight-emitting device 10. Here, the display apparatus 101 includes thelight-emitting device 1 that achieves improvement in uniformity of thein-plane luminance distribution as described in the first embodiment,thus leading to improvement in the display quality of the displayapparatus 101.

6. Application Example of Display Apparatus

In the following, an application example of the display apparatus 101 asdescribed above to electronic apparatuses is described. Examples of theelectronic apparatuses include a television, a digital camera, anotebook personal computer, a mobile terminal apparatus such as a mobilephone, and a video camera. In other words, the above-described displayapparatus is applicable to electronic apparatuses in every field thatdisplay externally inputted image signals or internally generated imagesignals as images or pictures.

FIG. 19A illustrates an external appearance of a tablet terminalapparatus (Application Example 1) to which the display apparatus 101 ofthe foregoing embodiment is applicable. FIG. 19B illustrates an externalappearance of another tablet terminal apparatus (Application Example 2)to which the display apparatus 101 of the foregoing embodiment isapplicable. Each of these tablet terminal apparatuses includes, forexample, a display section 210 and a non-display section 220, and thedisplay section 210 is configured by the display apparatus 101 of theforegoing embodiment.

7. Application Examples of Lighting Apparatus

Each of FIGS. 20 and 21 illustrates an external appearance of a tabletoplighting apparatus (Application Examples 3 and 4) to which thelight-emitting device 1 of the foregoing embodiment is applicable. Eachof these lighting apparatuses includes, for example, an illuminatingsection 843 attached to a support post 842 that is provided on a base841. The illuminating section 843 is configured by any of thelight-emitting devices 1 and 2 according, respectively, to the foregoingfirst and second embodiments. It is possible for the illuminatingsection 843 to take any shape such as a tubular shape illustrated inFIG. 20 and a curved surface shape illustrated in FIG. 21 , byconfiguring components such as a substrate 2, a reflective plate 3, andan optical sheet 4 in curved shapes.

FIG. 22 illustrates an external appearance of an indoor lightingapparatus (Application Example 5) to which the light-emitting device 1of the foregoing embodiments is applicable. The lighting apparatusincludes an illuminating section 844 that is configured by any of thelight-emitting devices 1 and 2 according to the foregoing embodiments,for example. The appropriate number of the illuminating sections 844 aredisposed at appropriate intervals on a ceiling 850A of a building. It isto be noted that the illuminating section 844 may be installed not onlyon the ceiling 850A, but also on any location such as a wall 850B or afloor (not illustrated in the diagram) depending on the intended use.

In these lighting apparatuses, illumination is performed through thelight from the light-emitting device 10. Here, the lighting apparatusesinclude the light-emitting device 10 that improves the homogeneity ofthe in-plane luminance distribution, thus leading to improvement inillumination quality. It is to be noted that these lighting apparatusesmay be provided with any of the light-emitting devices 1A to 1C, 2, 2Ato 2C in place of the light-emitting device 1.

8. Experimental Examples Experimental Example 1-1

A sample of the light-emitting device 1 according to the above-describedfirst embodiment was produced, with the proviso that, as illustrated inFIG. 23 , an X-direction (a horizontal direction) dimension X40 and aY-direction (a vertical direction) dimension Y40 of (an outer edge ofthe peripheral part 42 of) the back chassis 40 were set to 699 mm and400 mm, respectively. In addition, an X-direction dimension X41 and aY-direction dimension Y41 of the central part 41 of the back chassis 40were set to 492 mm and 185 mm, respectively. In addition, dimensionsY42A, Y42B, X42C, X42D, X50, and Y50 of respective parts illustrated inFIG. 23 were set to 104 mm, 104 mm, 104 mm, 104 mm, 50 mm, and 50 mm,respectively. Further, five pieces each of the light source 10 and thelens 20 were mounted to allow five pieces each thereof to be arrangedside by side in the X-direction and two pieces each thereof to bearranged side by side in the Y-direction on the central part 41.

Experimental Example 1-2

A sample of the light-emitting device was produced similarly toExperimental Example 1-1, except for a point that the light reflectionmember 50 was not provided.

Luminance levels Lv1 and Lv2 to be observed at respective twomeasurement points MP1 and MP2 were measured for each of the samples ofthe above-described Experimental Examples 1-1 and 1-2 and ratios(Lv2/Lv1) between the levels were obtained. Results thereof areindicated in Table 1. The measurement point MP1 is a position (H/60,V/40) corresponding to the corner (of the peripheral part 42) of theback chassis 40. The measurement point MP2 is a position (H/18, V/18)corresponding to the corner of the central part 41 of the back chassis40. It is to be noted Table 1 indicates numerical values obtained bynormalizing the luminance level Lv1 in Experimental Example 1-2 as 1.

TABLE 1 Luminance Level Lv1 Lv2 Lv2/Lv1 Experimental 1 1.41 1.41 Example1-1 Experimental 1 1.79 1.79 Example 1-2

As indicated in Table 1, it was possible to confirm that, inExperimental Example 1-1, the luminance level was higher at themeasurement point MP1 than Experimental Example 1-2 in which the lightreflection member 50 was not provided. That is, in Experimental Example1-1, the light reflection members 50 was disposed on the four corners ofthe back chassis 40. Therefore, it was confirmed that it was possible tocompensate for the luminance level reduction at the measurement pointMP1 (H/60, V/40), thus making it possible to alleviate the luminanceunevenness across the light emission region.

Experimental Example 2-1

Next, a sample of the light-emitting device 2 according to theabove-described second embodiment was produced, provided that, asillustrated in FIG. 24 , the X-direction (horizontal direction)dimension X40 and the Y-direction (vertical direction) dimension Y40 of(the outer edge of the peripheral part 42 of) the back chassis 40 wereset to 692 mm and 400 mm, respectively. In addition, the X-directiondimension X41 and the Y-direction dimension Y41 on the central part 41of the back chassis 40 were set to 492 mm and 185 mm, respectively. Inaddition, the dimensions Y42A, Y42B, X42C, and X42D of the respectiveparts illustrated in FIG. 24 were all set to 104 mm. Further, the tenlight sources 10 were mounted to allow five light sources 10 to bearranged side by side in the X-direction and two light sources 10 to bearranged side by side in the Y-direction on the central part 41. Thereflective lenses 71 were disposed to correspond to the respective lightsources 10 located at both ends in the X-direction. The refractivelenses 72 were disposed to correspond to the light sources 10 located atrespective locations other than both the ends in the X-direction. Inaddition, intervals between the mutually adjacent lenses were set to beequal.

Experimental Example 2-2

A sample of the light-emitting device was produced as ExperimentalExample 2-2 similarly to Experimental Example 2-1, except for a pointthat the reflective lenses 71 were totally replaced with the refractivelenses 72.

Experimental Example 2-3

Further, a sample of the light-emitting device was produced asExperimental Example 2-3 similarly to Experimental Example 2-1, exceptfor a point that the refractive lenses 72 were totally replaced with thereflective lenses 71.

The luminance distributions across the light emission regions of therespective samples of the above-described Experimental Examples 2-1 to2-3 were measured. Results thereof are illustrated in FIG. 25 to FIG. 27, respectively. In addition, Table 2 indicates results in whichluminance levels at measurement points MP3, MP5 and MP7 on the centralpart of the light emission region and luminance levels at measurementpoints MP4, MP6 and MP8 (H/60, V/40) on the peripheral part of the lightemission region were compared with one another altogether for each ofthe samples of Experimental Examples 2-1 to 2-3.

TABLE 2 Luminance Level Center Periphery Experimental Example 2-1 1 0.21Experimental Example 2-2 1.03 0.12 Experimental Example 2-3 0.69 0.29

Table 2 indicates numerical values obtained by normalizing the luminancelevel at the measurement point MP3 at the center of the light emissionregion of Experimental Example 2-1 as 1. As indicated in Table 2, it wasconfirmed that according to the technology, it is possible to alleviatethe lowering of luminance in the vicinity of the outer edge of the lightemission region while maintaining the luminance in the vicinity of thecenter of the light emission region. That is, although, in ExperimentalExample 2-2, the luminance at the measurement point MP5 is higher thanthe luminance at the measurement point MP3 in Experimental Example 2-1,a luminance drop at the measurement point MP6 is very large. Inaddition, although, in Experimental Example 2-3, the luminance at themeasurement point MP8 is higher than the luminance at the measurementpoint MP4 in Experimental Example 2-1, the luminance drop at themeasurement point MP7 was very large. Therefore, it was found that,according to the technology, it is possible to alleviate the lowering ofluminance on the peripheral region relative to the central region of thelight emission region while maintaining high entire luminanceefficiency.

Although the disclosure has been described hereinabove by giving theembodiments, the modification examples and experimental examples, thedisclosure is by no means limited to the foregoing embodiments, and soforth, and various modifications are possible. For example, althoughFIG. 7 illustrates an example in which the plurality of light sources 10and the plurality of lenses 71 and 72 are disposed in matrix, thedisclosure is not limited thereto. For example, only one light sourceunit 10U may be mounted that has the light sources 10 arranged side byside in one arrangement direction (X-direction), as in the lightemitting deice 2D illustrated in FIG. 28 . In this case, the lenses 71may be disposed on the both ends in the X-direction, and the lens 72 maybe disposed to be interposed between the lenses 71.

In addition, dimensions, dimensional ratios, and shapes of therespective constitutional elements illustrated in each drawing aremerely illustrative, and the disclosure is not limited thereto.

Further, for example, in the foregoing embodiments, the description hasbeen given on the case where the light source 10 is an LED; however, thelight source 10 may be configured by a semiconductor laser and so forth.

Additionally, for example, in the foregoing embodiments and modificationexamples, the description has been given by citing, as a specificexample, configurations of the light-emitting device 1 and the displayapparatus 101 (the television); however, it is unnecessary to provideall of the components, and other components may be provided.

It is to be noted that the effects described herein are merelyillustrative and non-limiting, and may further include other effects.Further, the technology may have the following configurations.

(1)

A light-emitting device including:

a main substrate that includes a central part and a peripheral part thatsurrounds the central part;

a plurality of light sources that are each disposed on the central partof the main substrate;

a plurality of lenses disposed to correspond to the plurality of lightsources respectively, the plurality of lenses applying optical effectsto beams of light from the plurality of light sources respectively; and

one or more light reflection members that are each disposed on theperipheral part, the light reflection members each having reflectancethat is higher than the reflectance of the main substrate.

(2)

The light-emitting device according to (1), in which

the main substrate has a rectangular planar shape in which a firstdirection is set as a longitudinal direction, and

the light reflection members are each disposed on four corners of theperipheral part of the main substrate.

(3)

The light-emitting device according to (2), in which

the peripheral part includes a first part and a second part that faceeach other with the central part being interposed therebetween in thefirst direction, and a third part and a fourth part that face each otherwith the central part being interposed therebetween in a seconddirection that is orthogonal to the first direction, and

the light reflection members are each disposed on the first part to thefourth part.

(4)

The light-emitting device according to any one of (1) to (3), furtherincluding a light source substrate on which the plurality of lightsources are arranged side by side in the first direction, the lightsource substrate being provided on the central part of the mainsubstrate.

(5)

The light-emitting device according to (4), in which

when a maximum value of intervals between the plurality of light sourcesthat are arranged side by side in the first direction is set as P,

the light reflection members are each provided in a region that is P/2or more apart from respective central positions of all the lightsources.

(6)

A light-emitting device including:

a main substrate;

a plurality of light sources that are each provided on the mainsubstrate;

a first lens that is provided to correspond to a first light source ofthe plurality of light sources, the first lens having a first shape; and

a second lens that is provided to correspond to a second light source ofthe plurality of light sources, the second lens having a second shapethat is different from the first shape.

(7)

The light-emitting device according to (6), in which

first light that is outputted from the first lens is configured tospread along the main substrate more than second light that is outputtedfrom the second light source.

(8)

The light-emitting device according to (7), in which

the first lens is a reflective lens that diffuses the light from one ofthe light sources along the main substrate, and

the second lens is a refractive lens that refracts the light from theother of the light sources to direct the light toward side opposite tothe main substrate.

(9)

The light emitting deice according to (7) or (8), in which

the main substrate has a rectangular planar shape in which a firstdirection is set as a longitudinal direction, and

the first lens is provided on each of four corners of the mainsubstrate.

(10)

The light-emitting device according to any one of (7) to (9), in which

the plurality of light sources are each disposed in matrix on the mainsubstrate, and

a plurality of the first lenses are provided to surround the secondlens.

(11)

The light-emitting device according to any one of (7) to (10), in which

the main substrate includes a central part on which the plurality oflight sources are provided and a peripheral part that surrounds thecentral part, and

the light-emitting device further includes one or more light reflectionmembers each provided on the peripheral part, the light reflectionmembers each having reflectance that is higher than the reflectance ofthe main substrate.

(12)

The light-emitting device according to (11), in which

the main substrate has a rectangular planar shape in which a firstdirection is set as a longitudinal direction, and

the light reflection members are each provided on four corners of theperipheral part of the main substrate.

(13)

A display apparatus including:

a liquid crystal panel; and

a light-emitting device on rear surface side of the liquid crystalpanel, the light-emitting device including

a main substrate that includes a central part and a peripheral part thatsurrounds the central part,

a plurality of light sources that are each disposed on the central partof the main substrate,

a plurality of lenses disposed to correspond to the plurality of lightsources respectively, the plurality of lenses applying optical effectsto beams of light from the plurality of light sources respectively, and

one or more light reflection members that are each disposed on theperipheral part, the light reflection members each having reflectancethat is higher than the reflectance of the main substrate.

(14)

A display apparatus including:

a liquid crystal panel; and

a light-emitting device on rear surface side of the liquid crystalpanel, the light-emitting device including

a main substrate,

a plurality of light sources that are each provided on the mainsubstrate,

a first lens that is provided to correspond to one light source of theplurality of light sources and has a first shape, and

a second lens that is provided to correspond to the other light sourceof the plurality of light sources and has a second shape that isdifferent from the first shape.

(15)

A lighting apparatus including a light-emitting device, thelight-emitting device including

a main substrate that includes a central part and a peripheral part thatsurrounds the central part,

a plurality of light sources that are each disposed on the central partof the main substrate,

a plurality of lenses disposed to correspond to the plurality of lightsources respectively, the plurality of lenses applying optical effectsto beams of light from the plurality of light sources respectively, and

one or more light reflection members that are each disposed on theperipheral part, the light reflection members each having reflectancethat is higher than the reflectance of the main substrate.

(16)

A lighting apparatus including a light-emitting device, thelight-emitting device including

a main substrate,

a plurality of light sources that are each provided on the mainsubstrate,

a first lens that is provided to correspond to one light source of theplurality of light sources and has a first shape, and

a second lens that is provided to correspond to the other light sourceof the plurality of light sources and has a second shape that isdifferent from the first shape.

The present application is based on and claims priority from JapanesePatent Application No. 2015-167267 filed with the Japan Patent Office onAug. 26, 2015, the entire contents of which is hereby incorporated byreference.

It should be understood by those skilled in the art that variousmodifications, combinations, sub-combinations and alterations may occurdepending on design requirements and other factors insofar as they arewithin the scope of the appended claims or the equivalents thereof.

The invention claimed is:
 1. A display apparatus comprising: a liquidcrystal panel; and a light-emitting device, wherein the light-emittingdevice comprises: a main substrate that includes a central part and aperipheral part that surrounds the central part; a plurality of lightsources that are disposed on the central part of the main substrate; aplurality of lenses disposed on the plurality of light sources to covertops and sides of the light sources, the plurality of lenses applyingoptical effects to beams of light from the plurality of light sources,respectively; a reflection sheet that covers the main substrate; and oneor more light reflection members that are disposed over the peripheralpart, the light reflection members having reflectance that is higherthan the reflectance of the main substrate, wherein the light reflectionmembers are angled at an obtuse angle in the vicinity of the peripheralpart with respect to the reflection sheet and a height of the lightreflection members at a distal end is higher than a height of theplurality of lenses.
 2. The display apparatus of claim 1, wherein theone or more light reflection members are in the corners of theperipheral part and have reflectance higher than the reflection sheet,the light reflection members each having a central fold line dividingthe light reflection members into two separate portions.
 3. The displayapparatus according to claim 2, further comprising a wavelengthconversion sheet between the liquid crystal panel and the mainsubstrate.
 4. The display apparatus according to claim 2, wherein theplurality of lenses comprises: at least one of a first lens that isprovided to correspond to at least a first light source of the pluralityof light sources, the first lens having a first shape; and at least oneof a second lens that is provided to correspond to at least a secondlight source of the plurality of light sources, the second lens having asecond shape that is different from the first shape.
 5. The displayapparatus according to claim 4, wherein the lenses contact and cover thelight sources.
 6. The display apparatus of claim 1, wherein theperipheral part that surrounds the central part of the main substrateforms at least one angle with the central part.
 7. The display apparatusof claim 1, wherein the main substrate comprises a resin.
 8. The displayapparatus according to claim 1, wherein the reflection sheet interposesthe one or more light reflection members and the peripheral part.
 9. Thedisplay apparatus according to claim 1, wherein the main substrate has arectangular planar shape in which a first direction is set as alongitudinal direction.
 10. The display apparatus according to claim 1,further comprising at least one light source substrate on which theplurality of light sources are arranged side by side in the firstdirection, the light source substrate being provided on the central partof the main substrate.
 11. The display apparatus according to claim 10,wherein the light source substrate is provided with a plurality of drivecircuits at corresponding positions of the plurality of light sources.12. The display apparatus according to claim 1, wherein when a maximumvalue of intervals between the plurality of light sources that arearranged side by side in the first direction is set as P, the lightreflection members are provided in a region that is P/2 or more apartfrom respective central positions of all the light sources.
 13. Thedisplay apparatus according to claim 1, wherein the plurality of lensescomprises: at least one of a first lens that is provided to correspondto at least a first light source of the plurality of light sources, thefirst lens having a first shape; and at least one of a second lens thatis provided to correspond to at least a second light source of theplurality of light sources, the second lens having a second shape thatis different from the first shape.
 14. The display apparatus accordingto claim 13, wherein first light that is outputted from the first lensis configured to spread along the main substrate more than second lightthat is outputted from the second light source.
 15. The displayapparatus according to claim 13, wherein the main substrate has arectangular planar shape in which a first direction is set as alongitudinal direction, and the first lens is provided on each of fourcorners of the main substrate.
 16. The display apparatus according toclaim 1, wherein the reflection sheet includes a light scatteringproperty.
 17. The display apparatus according to claim 1, furthercomprising an optical sheet between the liquid crystal panel and themain substrate.
 18. The display apparatus according to claim 17, furthercomprising a wavelength conversion sheet between the optical sheet andthe plurality of lenses.
 19. The display apparatus according to claim 1,wherein the lenses contact and cover the light sources.
 20. Alight-emitting device comprising: a main substrate that includes acentral part and a peripheral part that surrounds the central part; aplurality of light sources that are disposed on the central part of themain substrate; a plurality of lenses disposed on the plurality of lightsources to cover tops and sides of the light sources, the plurality oflenses applying optical effects to beams of light from the plurality oflight sources, respectively; a reflection sheet that covers the mainsubstrate; and one or more light reflection members that are disposedover the peripheral part, the light reflection members havingreflectance that is higher than the reflectance of the main substrate,wherein the light reflection members are angled at an obtuse angle inthe vicinity of the peripheral part with respect to the reflection sheetand a height of the light reflection members at a distal end is higherthan a height of the plurality of lenses.